科研之友
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摘要
After cooling a DyFe2/YFe2 superlattice to 12 K in a 1 T field, which aligns the Fe spins parallel to the field, the magnetization vs field curve of the superlattice was dramatically shifted along the magnetization and applied field axes. The zero of the unpinned magnetization, i.e., the exchange bias, was -2 T. We developed a one-dimensional spin-chain model that completely explains the polarized neutron reflectometry, magnetometry, and x-ray magnetic circular dichroism data. Two domain configurations were identified in the model. Both configurations contribute to the extraordinarily large exchange bias of the DyFe2/YFe2 superlattice.
- 出版日期2009-4
